Calcbiiating machine



July 27, 1937. L. P. CROSMAN I CALCULATING MACHINE Original Filed Oct. 2, 1935 INVENTOR.

Patented July 2 7, 1937 UNITED STATES PATENT OFFICE CALCULATING MACHINE 'Lorlng Pickering Crosman, Maplewood, N. J., as-

signor to Gardner Company, Orange, N. J., a

corooration'of Delaware Original application October 2, 1935, Serial No. 43,145. Divided and this application January 22, 1936, Serial No. 60,188

3Claims.

- 'Patent N0.'2,055',623.

The invention consists in the novel construe tion and combination of parts, as set forth in the appended claims.

In the accompanying drawing, illustrating the invention:

- Fig. 1 is a right side elevation of the full stroke devices as applied to the hand crank of an adding machine, the parts being shown in normal position of rest. j Fig.2 is a similar view, with the parts in midstroke position. l

Fig. 3 is a detail front view mechanism.

The novel full strokemechanism, whereby incomplete operation of the" reciprocatory hand crank of an adding machine is prevented, comprises a plate 40,, pivotally secured at 4| to the side frame, and a rocking pawl 42 pivotally secured at 43 to the frame and having a pin 44 exof the full stroke tending through slot 45 of plate 4|.

Plate 40 is provided with a projection 52 having opposed cam surfaces 46 and 4.1, said projection being urged laterally into the path of movement of full stroke arm 8 by spring 48, as shown in Fig. 3. During the forward or counter movement of full stroke arm 8 with hand-crank 4', to which it is attached, said arm will contact surface 46 and rock plate 40' clockwise (Pig. 2) about point 4l'until stopped by the wall of slot 49 engaging stud '43, whereupon continued forward movement of lever I cams plate 40 laterally out of the path of movement thereof. During the first described movement of plate 4|, pawl 42,

7 return the hand crank before completion of its through pin and-slot engagement "-45, will be rocked about point 43 to bring the tooth SI of said pawl free of the serrations ii of the full stroke arm 8, allowing said am to move quietly without the noise incident to the'usual spring pressed ratchet means. If, howeven'it is attempted to forward movement, full stroke arm 8, due to friction maintained by spring, would rock plate 4| and, through pin and slot engagement 4 and 44, pawl 42 counterclockwise (Fig. 2) to bring the tooth SI of said pawl into engagement with one of the notches ii of arm 8.

At the completion of aforward stroke, full stroke'arm l is carried beyond the point 52 of plate 4! and, owing to the pressure'of spring 48 the cam surface 41, acting against the rearward edge 53 of plate 8, will camsaid plate to its normal central position shown in Fig. '1. Upon return stroke of arm 8, the surface 53 engaging surface 41 of plate 40 rocks said plate in the opposite direction, to insure full movement of the handle as in forward operation; 4

I claim:

1. In a calculating machine having register actuators and a manipulable operating lever therefor; full stroke mechanism comprising a rack fast with said operating lever, a'pawl mounted on the frame of the machine and adapted to engage said rack after the operating lever moves out of full-stroke position in eitherdirection, and

a spring controlled member independently pivoted on the frame of the machine, having a. pin and slot connection with said pawl adapted to impart thereto a multiplied angular movement and having. frictional engagement with the rack to hold the pawl out of contact with the rack teeth during movement of said lever in a given direction, to engage the pawl withthe rack upon mid-stroke reversal of the lever, and to centralize the pawl relatively to the fulcrum of the lever and rack when said lever moves to full-stroke position.

2. In a. calculating machine having register actuators and a manipulable operating lever therefor; full-stroke mechanism comprising a rack fast with said operating lever, a pawl mounted on the frame of the machine and adapted to engage said rack after the operating lever moves out of full stroke position in either direction, and a spring controlled member pivotally mounted upon the frame of the machine, having pin and slot connection with said pawl, frictional engagementwith said rack to hold the pawl out of contact with the rack teeth, and a laterally disposed cam portion adapted to contact with said rack to centralize the pawl relatively to the fulcrum of the lever and rack.

3. In a calculating machine having register engage said rack after the operating lever moves out of full-stroke position in either direction, a plate pivotally mounted upon the frame of the machine, adapted for lateral movement and having a pin and slot connection with .said pawl, frictional engagement with said; rack, and a laterally disposed cam edge adapted to contact with said rack, and a spring acting upon said pawl relatively to the fulcrum of the lever and rack in full-stroke .position. I LORING EICKEIREIllGrv CBOSMAN.

plate in cooperation with the rack to hold the a 

